[Piglit] [PATCH 1/2] polygon-offset: draw tests in two rows of nine

[Brian Paul]

Render the 18 tests in two rows of nine, where the bottom row shows
the blue prim behind the red prim and the top row shows the blue prim
in front of the red prim.  This makes it a little easier to figure
out which test corresponds to which graphics state.

And add some comments.
---
 tests/general/polygon-offset.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/tests/general/polygon-offset.c b/tests/general/polygon-offset.c
index 2885171..ce0c644 100644
--- a/tests/general/polygon-offset.c
+++ b/tests/general/polygon-offset.c
@@ -30,8 +30,8 @@ PIGLIT_GL_TEST_CONFIG_BEGIN
 
 	config.supports_gl_compat_version = 10;
 
-	config.window_width = 400;
-	config.window_height = 300;
+	config.window_width = 600;
+	config.window_height = 150;
 	config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH;
 
 PIGLIT_GL_TEST_CONFIG_END
@@ -50,7 +50,7 @@ float red[3] = {1.0, 0.0, 0.0};
 float blue[3] = {0.0, 0.0, 1.0};
 
 #define SIZE	40
-#define SPACE	50
+#define SPACE	60
 
 #define X(x)	((x) * SPACE + SIZE/2)
 #define Y(y)	((y) * SPACE + SIZE/2)
@@ -102,16 +102,21 @@ piglit_display(void)
 	glEnable(GL_POLYGON_OFFSET_POINT);
 	glEnable(GL_POLYGON_OFFSET_LINE);
 
-	for (first_mode = 0; first_mode < 3; first_mode++) {
-		for (second_mode = 0; second_mode < 3; second_mode++) {
-			for (over = 0; over < 2; over++) {
+	/* loop: draw blue behind, draw blue in front */
+	for (over = 0; over < 2; over++) {
+		/* loop over GL_FILL, GL_LINE, GL_POINT fill mode for red quad */
+		for (first_mode = 0; first_mode < 3; first_mode++) {
+			/* loop over GL_FILL, GL_LINE, GL_POINT for blue quad */
+			for (second_mode = 0; second_mode < 3; second_mode++) {
+				/* draw red quad without an offset */
 				glPolygonOffset(0.0, 0.0);
 				do_rect(x, y, red, poly_mode[first_mode]);
+				/* draw blue quad with offset */
 				glPolygonOffset(0.0, over ? -1.0 : 1.0);
 				do_rect(x, y, blue, poly_mode[second_mode]);
 				pass = pass && check(x, y, over ? blue : red);
 
-				if (++x == 4) {
+				if (++x == 9) {
 					x = 0;
 					y++;
 				}
-- 
1.9.1